PRL Motorsports Baffled Coolant Expansion TankOver time, the factory plastic coolant expansion tanks that Honda Acura include from the factory can weaken and fail from heat and pressure cycles. The PRL Coolant Expansion Tank kit replaces the factory tank with a more robust aluminum version. Our 6061 aluminum tank will not be effected by temperature and can hold higher pressures so it will out last the factory tank. Our reservoir also more than doubles the tank's coolant capacity to 1. 32 quarts